Hello!
The correct answer to your question is: The Oregon Trail.
I really hope my answer helped you! c:
A military action the added territory in the United States in 1848 was the Treaty of Guadalupe Hidalgo. It ended the Mexican-American war and added the territories California, Arizona, Colorado, New Mexico, Nevada, Utah, and Wyoming.
One advantage of the "<span>gold standard"</span> was that the government could only issue currency if it had gold in the treasury to back it.
<span>The constitutional issues that were raised by federal policies during the war is that there's a return to isolationism. This was brought by the world war I, the congress passed the Nuetrality Acts, where it prohibit the Americans to travel on ships of nations at war. Other consequence is that they're not also allowed to sell arms to nations at war. Only non-military good are allowed to be sold.</span>